Graphene/TiO2 composite positive electrode preparation method

A composite positive electrode and graphene technology, which is applied in positive electrodes, battery electrodes, active material electrodes, etc., can solve problems such as difficult industrial production, and achieve the effects of simple preparation process, reduced spontaneous agglomeration, and increased contact probability

Pending Publication Date: 2020-02-21
CHANGSHA RES INST OF MINING & METALLURGY
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  • Abstract
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Problems solved by technology

However, the hydrothermal reaction conditions of titanium alkoxide hydrolysis and coating need to be precisely controlled, and it is difficult to realize industrial production

Method used

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  • Graphene/TiO2 composite positive electrode preparation method
  • Graphene/TiO2 composite positive electrode preparation method

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Experimental program
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Embodiment 1

[0028] A kind of graphene / TiO of the present invention 2 Composite cathode (G / TiO 2 @NCM523) preparation method, comprises the following steps:

[0029] (1) Weigh 0.003g TiO 2 (particle size 60nm) and 10g N-methylpyrrolidone (NMP), ultrasonic 10min (ultrasonic power is 300W); then add 0.1g graphene, continue to adopt cell pulverizer ultrasonic dispersion 1h (ultrasonic power is 300W), obtain graphene / TiO 2 Dispersions;

[0030] (2) to graphene / TiO 2 Add 2g NCM523 (nickel cobalt lithium manganese oxide) positive electrode active material in the dispersion liquid, seal ball milling 40min under 300r / min (ball material ratio 20:1, adopt zirconia beads), resulting in graphene / TiO 2 Mixture with NCM523;

[0031] (3) Air-dry the mixed solution at 100°C for 72 hours, grind it, and pass through a 325-mesh sieve to obtain graphene / TiO 2 Composite cathode powder with NCM523, No. G / TiO 2 @NCM523.

[0032] The scanning electron microscope of the composite positive electrode is ...

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Abstract

The invention discloses a graphene / TiO2 composite positive electrode preparation method, which comprises: (1) adding TiO2 to an organic solvent, carrying out ultrasonic treatment for 0.1-1 h, adding agraphene material, and carrying out ultrasonic treatment for 0.1-5 h to obtain a graphene / TiO2 dispersion liquid; and (2) adding a positive electrode active material into the graphene / TiO2 dispersionliquid, carrying out ball milling, and drying to obtain the graphene / TiO2 composite positive electrode. According to the preparation method, graphene / TiO2 is compounded with the positive electrode material, TiO2 can reduce the polarization degree and reduce agglomeration of graphene, so transmission of lithium ions among positive electrode particles is facilitated, and the electrochemical performance of the battery is improved; meanwhile, the graphene can also improve the defect of low electron conductivity of TiO2 and improve the overall electron conductivity of the positive electrode.

Description

technical field [0001] The invention belongs to the field of batteries, in particular to a graphene / TiO used in solid-state lithium secondary batteries 2 Preparation method of composite positive electrode. Background technique [0002] Lithium-ion batteries have been widely used and paid attention to due to their advantages such as high working voltage, high energy density, long cycle life, and low pollution. With the deepening of research, higher requirements have been put forward for the energy density, cycle performance, and rate performance of lithium-ion batteries. Among them, the cathode material is an important factor that limits the development of these aspects of lithium-ion batteries. [0003] The organic electrolyte used in traditional lithium-ion batteries is prone to combustion and explosion, and there are safety issues. The safety of all-solid lithium-ion batteries is improved due to the use of solid electrolytes. However, the room temperature ionic conducti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/139H01M4/36H01M4/48H01M4/583H01M10/0525
CPCH01M4/139H01M4/362H01M4/48H01M4/583H01M10/0525H01M2004/028Y02E60/10
Inventor 庄子龙涂飞跃鞠博伟杨乐之陈涛雷刚周倩廖寒潇王艳华肖可颂覃事彪邓致远唐雅婷
Owner CHANGSHA RES INST OF MINING & METALLURGY
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